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Red Hat Security Advisory
Synopsis: Important: kernel-alt security and bug fix update
Advisory ID: RHSA-2018:2772-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2772
Issue date: 2018-09-25
CVE Names: CVE-2017-18202
=====================================================================
1. Summary:
An update for kernel-alt is now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.
2. Relevant releases/architectures:
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) – aarch64, noarch, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) – aarch64, noarch, ppc64le
3. Description:
The kernel-alt packages provide the Linux kernel version 4.x.
Security Fix(es):
* kernel: Infoleak/use-after-free in __oom_reap_task_mm function in
mm/oom_kill.c (CVE-2017-18202)
For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.
Bug Fix(es):
* Previously, on certain little-endian variants of IBM Power Systems, there
was no “sysfs spec_store_bypass” file. As a consequence, there was no way
to indicate the Speculative Store Bypass Disable (SSBD) mitigation status.
This update adds infrastructure code into the kernel to create the
/sys/devices/system/cpu/vulnerabilities/* files. As a result, sysfs
spec_store_bypass shows whether the SSBD mitigation is disabled or enabled.
(BZ#1602340)
* Previously, the kernel architectures for IBM z Systems were missing
support to display the status of the Spectre v2 mitigations. As a
consequence, the /sys/devices/system/cpu/vulnerabilities/spectre_v2 file
did not exist. With this update, the kernel now shows the status in the
above mentioned file and as a result, the file now reports either
“Vulnerable” or “Mitigation: execute trampolines” message. (BZ#1619667)
4. Solution:
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
5. Bugs fixed (https://bugzilla.redhat.com/):
1549621 – CVE-2017-18202 kernel: Infoleak/use-after-free in __oom_reap_task_mm function in mm/oom_kill.c
6. Package List:
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):
Source:
kernel-alt-4.14.0-49.13.1.el7a.src.rpm
aarch64:
kernel-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-debug-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-debug-devel-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-devel-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-headers-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-tools-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-tools-libs-4.14.0-49.13.1.el7a.aarch64.rpm
perf-4.14.0-49.13.1.el7a.aarch64.rpm
perf-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
python-perf-4.14.0-49.13.1.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
noarch:
kernel-abi-whitelists-4.14.0-49.13.1.el7a.noarch.rpm
kernel-doc-4.14.0-49.13.1.el7a.noarch.rpm
ppc64le:
kernel-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-bootwrapper-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-debug-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-devel-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-headers-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-tools-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-tools-libs-4.14.0-49.13.1.el7a.ppc64le.rpm
perf-4.14.0-49.13.1.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
python-perf-4.14.0-49.13.1.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
s390x:
kernel-4.14.0-49.13.1.el7a.s390x.rpm
kernel-debug-4.14.0-49.13.1.el7a.s390x.rpm
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm
kernel-debug-devel-4.14.0-49.13.1.el7a.s390x.rpm
kernel-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm
kernel-debuginfo-common-s390x-4.14.0-49.13.1.el7a.s390x.rpm
kernel-devel-4.14.0-49.13.1.el7a.s390x.rpm
kernel-headers-4.14.0-49.13.1.el7a.s390x.rpm
kernel-kdump-4.14.0-49.13.1.el7a.s390x.rpm
kernel-kdump-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm
kernel-kdump-devel-4.14.0-49.13.1.el7a.s390x.rpm
perf-4.14.0-49.13.1.el7a.s390x.rpm
perf-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm
python-perf-4.14.0-49.13.1.el7a.s390x.rpm
python-perf-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):
aarch64:
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
kernel-tools-libs-devel-4.14.0-49.13.1.el7a.aarch64.rpm
perf-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm
noarch:
kernel-doc-4.14.0-49.13.1.el7a.noarch.rpm
ppc64le:
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-debug-devel-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
kernel-tools-libs-devel-4.14.0-49.13.1.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2017-18202
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/cve/CVE-2017-18202
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2018 Red Hat, Inc.
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